OHA Drinking Water Services
OR41
PWS ID: 92508 ---- USFS SOUTH TWIN LAKE CG
System Type: NC    Population: 155


Current Open Coliform Sample Schedule
(subject to change based upon future test results)
DIST-A:  1 Routine sample(s)  per Month to be taken beginning 09/01/2023 -

(A begin date of 01/01/1991 indicates the year the Total Coliform Rule was established)

Public water systems that use chlorine or chloramines must measure the residual disinfectant level at the same points in the distribution system and at the same time when total coliforms are sampled.

Repeat, Temporary Routine, and Prior Coliform Sample Schedules
(Schedules in bold reflect current schedules)

GWR:  1 Triggered sample(s) to be taken and reported  07/07/2024 - 07/18/2024
       1 at SRC-AA - WELL
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   07/08/2024 - 07/18/2024  at DIST-A  
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TCR:  3 Temporary Routine sample(s) per Month to be taken   08/01/2023 - 08/31/2023  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  07/27/2023 - 08/07/2023
       1 at SRC-AA - WELL
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   07/28/2023 - 08/07/2023  at DIST-A  
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TCR:  1 Routine sample(s) per Month to be taken   07/01/2023 - 07/31/2023  at DIST-A  
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GWR:  1 Assessment sample(s) Year  01/01/2012 - 12/31/2021  at SRC-AA  WELL
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TCR:  1 Routine sample(s) per Month to be taken   04/01/2016 - 12/31/2021  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  08/03/2021 - 08/14/2021
       1 at SRC-AA - WELL
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   08/04/2021 - 08/14/2021  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  09/03/2018 - 09/14/2018
       1 at SRC-AA - WELL
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   09/04/2018 - 09/14/2018  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  06/04/2018 - 06/15/2018
       1 at SRC-AA - WELL
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   06/05/2018 - 06/15/2018  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  08/03/2017 - 08/14/2017
       1 at SRC-AA - WELL
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   08/04/2017 - 08/14/2017  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  07/06/2017 - 07/17/2017
       1 at SRC-AA - WELL
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TCR:  3 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   07/07/2017 - 07/17/2017  at DIST-A  
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TCR:  1 Routine sample(s) per Quarter to be taken   10/01/2013 - 03/31/2016  at DIST-A  
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TCR:  1 Routine sample(s) per Month to be taken   09/01/2013 - 09/30/2013  at DIST-A  
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TCR:  5 Temporary Routine sample(s) per Month to be taken   08/01/2013 - 08/31/2013  at DIST-A  
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TCR:  1 Routine sample(s) per Quarter to be taken   01/01/2013 - 07/31/2013  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  07/08/2013 - 07/23/2013
       1 at SRC-AA - WELL
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TCR:  4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   07/09/2013 - 07/23/2013  at DIST-A  
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TCR:  5 Temporary Routine sample(s) per Month to be taken   10/01/2012 - 10/31/2012  at DIST-A  
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TCR:  5 Temporary Routine sample(s) per Month to be taken   09/01/2012 - 09/30/2012  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  09/13/2012 - 09/28/2012
       1 at SRC-AA - WELL
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TCR:  4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   09/14/2012 - 09/28/2012  at DIST-A  
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TCR:  5 Temporary Routine sample(s) per Month to be taken   08/01/2012 - 08/31/2012  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  08/08/2012 - 08/23/2012
       1 at SRC-AA - WELL
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TCR:  4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   08/09/2012 - 08/23/2012  at DIST-A  
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TCR:  1 Routine sample(s) per Quarter to be taken   01/01/2011 - 07/31/2012  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  07/09/2012 - 07/24/2012  at SRC-AA  WELL
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TCR:  4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   07/10/2012 - 07/24/2012  at DIST-A  
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TCR:  5 Temporary Routine sample(s) per Month to be taken   11/01/2010 - 11/30/2010  at DIST-A  
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TCR:  1 Routine sample(s) per Quarter to be taken   10/01/2010 - 10/31/2010  at DIST-A  
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TCR:  4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   10/08/2010 - 10/22/2010  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  10/07/2010 - 10/21/2010  at SRC-AA  WELL
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TCR:  5 Temporary Routine sample(s) per Month to be taken   09/01/2010 - 09/30/2010  at DIST-A  
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TCR:  4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   08/17/2010 - 08/31/2010  at DIST-A  
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TCR:  5 Temporary Routine sample(s) per Month to be taken   08/01/2010 - 08/31/2010  at DIST-A  
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TCR:  4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   08/12/2010 - 08/26/2010  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  08/11/2010 - 08/25/2010  at SRC-AA  WELL
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TCR:  1 Routine sample(s) per Quarter to be taken   01/01/1991 - 07/31/2010  at DIST-A  
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TCR:  4 Repeat sample(s) within 24 hours of a TC+ Routine Sample to be reported   07/09/2010 - 07/23/2010  at DIST-A  
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GWR:  1 Triggered sample(s) to be taken and reported  07/08/2010 - 07/22/2010  at SRC-AA  WELL
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Hide schedules prior to 2021


Instructions and Notes
  1. If no prior sample schedules appear, then no prior schedules exist within the database.
  2. Schedules for Oregon very small systems might not appear. If the system is active, samples must be collected for the presence of coliform bacteria once per month or once per quarter depending on water type, seasonal operating cycle, or previous sampling results.
  3. If a sample tests positive for total coliform or E. coli, a minimum of 3 repeat samples must be collected. At water systems where quarterly monitoring takes place, 3 routine samples must be collected the month following one in which a routine sample tested positive for the presence of total coliform or E. coli.

    Any time a sample tests positive for the presence of coliform bacteria, the system's operator should contact their regulator. For this water system, that is:
    DESCHUTES CO ENV HEALTH
    Jeff Freund
    (541) 388-6563



More information for this water system: SDWIS ID 2657
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